HI,
I continue working on STM32 Ethernet driver. I'd like to understand
the right implementation of the netif_linkoutput.
1. What should driver do if it has no free DMA descriptors to post
output packet? Should it try to wait some time? If yes what is a
reasonable wait time?
2. As far as I can see linkoutput is called from tcpip_thread context
(in case of OS usage). Should it be reenterable? I do not think so but
want to make sure as in original implementation there is a semaphore
taken at the beginning and given at the end.
if (xSemaphoreTake(xTxSemaphore, netifGUARD_BLOCK_TIME))
{
/* Post pbuf to DMA descriptor(s) */
....
.....
xSemaphoreGive(xTxSemaphore);
}
return ERR_OK;
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